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spamd is a BSD licensed daemon written by and shipped as part of the OpenBSD project. Its goal is to provide an effective, lightweight spam filter with a minimum of false positives. spamd first appeared in OpenBSD 3.3.

spamd is also the name of the binary used by the SpamAssassin mail filtering system when it is run as a daemon.

Uses and features

OpenBSD's spamd is most useful in preventing inbound spam from reaching mail servers. It can also be used as a partial application level proxy to ensure that external mail servers connecting to internal mail servers behave legitimately. Additionally, spamd can be very useful in preventing outgoing spam from systems that may be compromised or under the control of spammers. It can be used to block spammers with the use of blacklists, such as the SPEWS database or other lists of IPs, and features including small windows sizes and stuttering can slow down spam reception considerably and hold connections open for a significant amount of time. Another ability is greylisting: this forces email to be delayed for a configurable period, requiring the remote end to resend mail at least once in order for it to be delivered.

External links

OpenBSD's spamd man page
Article: Annoying spammers with pf and spamd
Jacek Artymiak's Building Firewalls with OpenBSD and PF, 2nd ed. Sample chapter 13: Using spamd. (PDF)

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 ==Uses and features==
-spamd is most useful in preventing inbound spam from reaching [[Mail_transfer_agent|mail servers]]. It can also be used as a partial [[Application_software|application]] level [[proxy]] to ensure that external mail servers connecting to internal mail servers behave legitimately. Additionally, spamd can be very useful in preventing outgoing spam from systems that may be compromised or under the control of spammers. It can be used to block spammers with the use of [[blacklist]]s, such as the [[SPEWS]] [[database]] or other lists of [[IP_address|IP]]s, and features including small windows sizes and stuttering can slow down spam reception considerably and hold connections open for a significant amount of time. Another ability is [[greylisting]]: this forces email to be delayed for a configurable period, requiring the remote end to resend mail at least once in order for it to be delivered.
+OpenBSD's spamd is most useful in preventing inbound spam from reaching [[Mail_transfer_agent|mail servers]]. It can also be used as a partial [[Application_software|application]] level [[proxy]] to ensure that external mail servers connecting to internal mail servers behave legitimately. Additionally, spamd can be very useful in preventing outgoing spam from systems that may be compromised or under the control of spammers. It can be used to block spammers with the use of [[blacklist]]s, such as the [[SPEWS]] [[database]] or other lists of [[IP_address|IP]]s, and features including small windows sizes and stuttering can slow down spam reception considerably and hold connections open for a significant amount of time. Another ability is [[greylisting]]: this forces email to be delayed for a configurable period, requiring the remote end to resend mail at least once in order for it to be delivered.
 ==External links==